// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace Microsoft.EntityFrameworkCore.Metadata.Internal;

/// <summary>
///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
///     the same compatibility standards as public APIs. It may be changed or removed without notice in
///     any release. You should only use it directly in your code with extreme caution and knowing that
///     doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public static class TypeBaseExtensions
{
    /// <summary>
    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
    ///     any release. You should only use it directly in your code with extreme caution and knowing that
    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
    /// </summary>
    public static ITypeBase GetPropertyAccessRoot(this ITypeBase structuralType)
        => structuralType switch
        {
            IEntityType entityType => entityType,
            IComplexType declaringComplexType when declaringComplexType.ComplexProperty.IsCollection => declaringComplexType,
            IComplexType declaringComplexType => declaringComplexType.ComplexProperty.DeclaringType.GetPropertyAccessRoot(),
            _ => throw new NotImplementedException()
        };
}
